INFO: task syz.9.8895:6387 blocked for more than 143 seconds.
Tainted: G W L Y syzk
Tainted: G W L Y syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.8895 state:D stack:27128 pid:6387 tgid:6384 ppid:645 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5581 [inline]
__schedule+0x1b47/0x5b40 kernel/sched/core.c:7384
__schedule_loop kernel/sched/core.c:7461 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7476
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7533
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:874
nfsctl_transaction_write fs/nfsd/nfsctl.c:117 [inline]
nfsctl_transaction_read+0x171/0x1c0 fs/nfsd/nfsctl.c:132
vfs_read+0x213/0xa80 fs/read_write.c:572
ksys_read+0x150/0x270 fs/read_write.c:716
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b3b19e199
RSP: 002b:00007f9b3c0ea028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f9b3b426090 RCX: 00007f9b3b19e199
RDX: 0000000000000400 RSI: 0000200000000280 RDI: 0000000000000003
RBP: 00007f9b3b2350b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9b3b426128 R14: 00007f9b3b426090 R15: 00007fffae79f5d8
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Tainted: G W L Y syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN, [L]=SOFTLOCKUP, [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]
watchdog+0x1058/0x10d0 kernel/hung_task.c:598
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11221 Comm: syz.7.10342 Tainted: G W L Y syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN, [L]=SOFTLOCKUP, [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:190 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:242 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x52/0xb0 kernel/kcov.c:318
Code: 00 0f 41 81 f8 00 01 00 00 41 0f 95 c0 81 f9 00 00 00 10 0f 93 c1 44 08 c1 75 67 83 ba 44 17 00 00 00 74 5e 8b 8a 18 17 00 00 <83> f9 03 75 53 48 8b 8a 20 17 00 00 44 8b 8a 1c 17 00 00 48 8b 11
RSP: 0018:ffffc90003cf6d68 EFLAGS: 00000246
RAX: ffffffff8a8622b8 RBX: 0000000000000002 RCX: 0000000000000002
RDX: ffff888088c13e80 RSI: 0000000000000002 RDI: 0000000000000008
RBP: 0000000000000002 R08: ffff88804a3dfad7 R09: 0000000000000005
R10: ffff88804a3dfad5 R11: ffffed100947bf5b R12: ffffffff90361bd0
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fbf127c36c0(0000) GS:ffff888124dbd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000a038 CR3: 000000007e138000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
xfrm_aalg_get_byidx+0x18/0x40 net/xfrm/xfrm_algo.c:771
dump_esp_combs net/key/af_key.c:3028 [inline]
pfkey_send_acquire+0x1c62/0x2d70 net/key/af_key.c:3261
km_query+0x11c/0x210 net/xfrm/xfrm_state.c:2836
xfrm_state_find+0x3fe6/0x5f90 net/xfrm/xfrm_state.c:1572
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2523 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2574 [inline]
xfrm_resolve_and_create_bundle+0x80b/0x33c0 net/xfrm/xfrm_policy.c:2878
xfrm_lookup_with_ifid+0x2a6/0x1db0 net/xfrm/xfrm_policy.c:3216
xfrm_lookup net/xfrm/xfrm_policy.c:3347 [inline]
xfrm_lookup_route+0x3c/0x1c0 net/xfrm/xfrm_policy.c:3358
udp_sendmsg+0x144a/0x2140 net/ipv4/udp.c:1432
sock_sendmsg_nosec+0x10f/0x190 net/socket.c:801
__sock_sendmsg net/socket.c:818 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2715
___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
__sys_sendmmsg+0x273/0x4d0 net/socket.c:2858
__do_sys_sendmmsg net/socket.c:2885 [inline]
__se_sys_sendmmsg net/socket.c:2882 [inline]
__x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2882
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbf1199e199
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbf127c3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fbf11c25fa0 RCX: 00007fbf1199e199
RDX: 000000000800001d RSI: 0000200000007fc0 RDI: 0000000000000004
RBP: 00007fbf11a350b8 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000001c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbf11c26038 R14: 00007fbf11c25fa0 R15: 00007ffdcd3536c8